Delay-rate tradeoff for ergodic interference alignment in the Gaussian case

Details Delay-rate tradeoff for ergodic interference alignment in the Gaussian case Delay-rate tradeoff for ergodic interference alignment in the Gaussian case

2010-01-14

arxiv.org/abs/1001.2582v2

Computer Science

Information Theory

7 pages, 2 figures, presented at 48th Allerton Conference on Communication Control and Computing, 2010. Includes appendix deta

Scientific paper

10.1109/ALLERTON.2010.5707028

In interference alignment, users sharing a wireless channel are each able to achieve data rates of up to half of the non-interfering channel capacity, no matter the number of users. In an ergodic setting, this is achieved by pairing complementary channel realizations in order to amplify signals and cancel interference. However, this scheme has the possibility for large delays in decoding message symbols. We show that delay can be mitigated by using outputs from potentially more than two channel realizations, although data rate may be reduced. We further demonstrate the tradeoff between rate and delay via a time-sharing strategy. Our analysis considers Gaussian channels; an extension to finite field channels is also possible.

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